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Chapter 5 Resets, Interrupts, and General System Control

MC9S08QL8 MCU Series Reference Manual, Rev. 1

NXP Semiconductors

59

 

When the 1 kHz clock source is selected, the COP counter is re-initialized to zero upon entry to stop mode. 
The COP counter begins from zero after the MCU exits stop mode.

5.5

Interrupts

Interrupts provide a way to save the current CPU status and registers, execute an interrupt service routine 
(ISR), and then restore the CPU status so processing can resume where it left off before the interrupt. Other 
than the software interrupt (SWI), which is a program instruction, interrupts are caused by hardware events 
such as an edge on the IRQ pin or a timer-overflow event.

If an event occurs in an enabled interrupt source, an associated read-only status flag will become set. The 
CPU will not respond unless the local interrupt enable is a 1 (enabled) and the I bit in the CCR is 0 to allow 
interrupts. The global interrupt mask (I bit) in the CCR is initially set after reset which prevents all 
maskable interrupt sources. The user program initializes the stack pointer and performs other system setup 
before clearing the I bit to allow the CPU to respond to interrupts.

When the CPU receives a qualified interrupt request, it completes the current instruction before responding 
to the interrupt. The interrupt sequence obeys the same cycle-by-cycle sequence as the SWI instruction 
and consists of:

•

Saving the CPU registers on the stack

•

Setting the I bit in the CCR to mask further interrupts

•

Fetching the interrupt vector for the highest-priority interrupt that is currently pending

•

Filling the instruction queue with the first three bytes of program information starting from the 
address fetched from the interrupt vector locations

While the CPU is responding to the interrupt, the I bit is automatically set to avoid the possibility of 
another interrupt interrupting the ISR itself (this is called nesting of interrupts). Normally, the I bit is 
restored to 0 when the CCR is restored from the value stacked on entry to the ISR. In rare cases, the I bit 
can be cleared inside an ISR (after clearing the status flag that generated the interrupt) so that other 
interrupts can be serviced without waiting for the first service routine to finish. This practice is not 
recommended for anyone other than the most experienced programmers because it can lead to subtle 
program errors that are difficult to debug.

The interrupt service routine ends with a return-from-interrupt (RTI) instruction which restores the CCR, 
A, X, and PC registers to their pre-interrupt values by reading the previously saved information from the 
stack. 

NOTE

For compatibility with M68HC08 devices, the H register is not 
automatically saved and restored. It is good programming practice to push 
H onto the stack at the start of the interrupt service routine (ISR) and restore 
it immediately before the RTI that is used to return from the ISR.

If more than one interrupt is pending when the I bit is cleared, the highest priority source is serviced first 
(see 

Table 5-2

).

Содержание MC9S08QL4

Страница 1: ...MC9S08QL8 MCU Series Reference Manual Rev 1 NXP Semiconductors 1 MC9S08QL8 MCU Series Reference Manual Covers MC9S08QL8 MC9S08QL4 MC9S08QL8RM Rev 1 07 2018...

Страница 2: ...rrent Your printed copy may be an earlier revision To verify you have the latest information available refer to http nxp com The following revision history table summarizes changes contained in this d...

Страница 3: ...6 Parallel Input Output Control 77 Chapter 7 Keyboard Interrupt S08KBIV2 89 Chapter 8 Central Processor Unit S08CPUV5 95 Chapter 9 Analog Comparator S08ACMPVLPV1 115 Chapter 10 Analog to Digital Conve...

Страница 4: ...MC9S08QL8 MCU Series Reference Manual Rev 1 4 NXP Semiconductors...

Страница 5: ...in 21 2 4 4 Background Mode Select BKGD MS 21 2 4 5 General Purpose I O GPIO and Peripheral Ports 22 Chapter 3 Modes of Operation 3 1 Introduction 25 3 2 Features 25 3 3 Run Mode 25 3 3 1 Low Power Ru...

Страница 6: ...res 57 5 3 MCU Reset 57 5 4 Computer Operating Properly COP Watchdog 58 5 5 Interrupts 59 5 5 1 Interrupt Stack Frame 60 5 5 2 External Interrupt Request IRQ Pin 60 5 5 3 Interrupt Vectors Sources and...

Страница 7: ...ers 85 Chapter 7 Keyboard Interrupt S08KBIV2 7 1 Introduction 89 7 1 1 KBI Clock Gating 89 7 1 2 Features 90 7 1 3 Modes of Operation 90 7 1 4 Block Diagram 90 7 2 External Signal Description 91 7 3 R...

Страница 8: ...onfiguration Information 115 9 1 2 ACMP TPM Configuration Information 115 9 1 3 ACMP Clock Gating 115 9 1 4 Stop1 Not Available 115 9 1 5 Features 116 9 1 6 Modes of Operation 116 9 1 7 Block Diagram...

Страница 9: ...6 MCU Wait Mode Operation 140 10 4 7 MCU Stop3 Mode Operation 140 10 4 8 MCU Stop2 Mode Operation 141 10 5 Initialization Information 141 10 5 1 ADC Module Initialization Example 141 10 6 Application...

Страница 10: ...Register MTIMMOD 169 12 4 Functional Description 170 12 4 1 MTIM Operation Example 171 Chapter 13 Real Time Counter S08RTCV1 13 1 Introduction 173 13 1 1 ADC Hardware Trigger 173 13 1 2 RTC Clock Sou...

Страница 11: ...th Modulator S08TPMV3 15 1 Introduction 201 15 1 1 ACMP TPM Configuration Information 201 15 1 2 TPM External Clock 201 15 1 3 TPM Pin Repositioning 201 15 1 4 TPM Clock Gating 201 15 1 5 TPMV3 Differ...

Страница 12: ...6 1 1 Forcing Active Background 225 16 1 2 Module Configuration 225 16 1 3 Features 226 16 2 Background Debug Controller BDC 226 16 2 1 BKGD Pin Description 227 16 2 2 Communication Details 227 16 2 3...

Страница 13: ...types and package types 1 1 Devices in the MC9S08QL8 Series Table 1 1 summarizes the feature set available in the MC9S08QL8 series of MCUs t Table 1 1 MC9S08QL8 Series Features by MCU and Package Fea...

Страница 14: ...2 KBIP6 ADP6 VOLTAGE REGULATOR PORT A PTA1 KBIP1 ADP1 ACMP ANALOG COMPARATOR ACMP LOW POWER OSCILLATOR 20 MHz INTERNAL CLOCK SOURCE ICS 31 25 kHz to 38 4 kHz 1 MHz to 16 MHz XOSC VSS VDD ANALOG TO DIG...

Страница 15: ...entral Processor Unit CPU 5 Internal Clock Source ICS 3 Keyboard Interrupt KBI 2 Low Power Oscillator XOSCVLP 1 Modulo Timer MTIM 1 Real Time Counter RTC 1 Timer Pulse Width Modulator TPM 3 Serial Com...

Страница 16: ...dules ICSIRCLK This is the internal reference clock and can be selected as the real time counter clock source Chapter 11 Internal Clock Source S08ICSV3 explains the ICSIRCLK in more detail See Chapter...

Страница 17: ...2 2 shows the pin assignments in the packages for the MC9S08QL8 series devices Figure 2 1 MC9S08QL8 Series in 20 Pin TSSOP Package 1 2 3 4 5 6 7 8 9 10 11 13 14 PTC2 PTB4 PTC3 PTC0 PTB3 KBIP7 ADP7 PTB...

Страница 18: ...8QL8 Series in 16 Pin TSSOP Packages 1 2 3 4 5 6 7 8 9 10 11 13 14 PTB4 PTB3 KBIP7 ADP7 PTB2 KBIP6 ADP6 PTB1 KBIP5 TxD ADP5 PTB0 KBIP4 RxD ADP4 PTA2 KBIP2 ADP2 PTA3 KBIP3 ADP3 PTA1 KBIP1 ADP1 ACMP PTA...

Страница 19: ...ATOR OPTIONAL EMC PROTECTION VDD 4 7 k 10 k 0 1 F XTAL EXTAL NOTES 1 VDDA VREFH and VSSA VREFL are tired with VDD and VSS respectively 2 RESET pin can only be used to reset into user mode you can not...

Страница 20: ...ule The oscillator can be configured to run in stop2 or stop3 modes For more information on the ICS see Chapter 11 Internal Clock Source S08ICSV3 The oscillator XOSCVLP in this MCU is a Pierce oscilla...

Страница 21: ...must not be driven above VDD NOTE The voltage on the internally pulled up RESET pin when measured will be below VDD The internal gates connected to this pin are pulled to VDD If the RESET pin is requi...

Страница 22: ...TA5 IRQ TCLK RESET pins are bi directional when configured as BKGD and RESET respectively When a port pin is configured as a general purpose output or a peripheral uses the port pin as an output softw...

Страница 23: ...VDD 4 4 VSS 5 5 PTB7 EXTAL 6 6 PTB6 XTAL 7 7 PTB5 TPMCH01 1 TPMCH0 pin can be repositioned at PTB5 using TPMCH0PS in SOPT2 default reset location is PTA0 8 8 PTB4 9 PTC3 10 PTC2 11 PTC1 12 PTC0 13 9 P...

Страница 24: ...Chapter 2 Pins and Connections MC9S08QL8 MCU Series Reference Manual Rev 1 24 NXP Semiconductors...

Страница 25: ...tor is in standby Stop modes System clocks are stopped and voltage regulator is in standby Stop3 All internal circuits are powered for fast recovery Stop2 Partial power down of internal circuits RAM c...

Страница 26: ...ting the LPWUI bit in the SPMSC2 register The ICS can then be set for full speed immediately in the interrupt service routine If the LPWUI bit is clear interrupts will be serviced in low power run mod...

Страница 27: ...For additional information about the active background mode refer to the Chapter 16 Development Support 3 5 Wait Mode Wait mode is entered by executing a WAIT instruction Upon execution of the WAIT in...

Страница 28: ...egulator is in standby In stop2 the voltage regulator is in partial powerdown The ICS module can be configured to leave the reference clocks running See Chapter 11 Internal Clock Source S08ICSV3 for m...

Страница 29: ...point The CPU takes the reset vector In addition to the above upon waking from stop2 the PPDF bit in SPMSC2 is set This flag is used to direct user code to go to a stop2 recovery routine PPDF remains...

Страница 30: ...the internal interrupt sources results in the MCU taking the appropriate interrupt vector 3 6 2 1 Stop3 Mode Recovery Time The stop3 recovery time is defined as the interval from the exit trigger to t...

Страница 31: ...that the MCU is in either stop or wait mode The BACKGROUND command can be used to wake the MCU from stop and enter active background mode if the ENBDM bit is set After entering background debug mode a...

Страница 32: ...n LPWAIT mode Assumes WAIT instruction executed 0 0 x 1 0 CPU clock is off peripheral clocks at low speed ICS in FBELP mode off standby 1 0 STOP3 Assumes STOPE bit is set and STOP instruction executed...

Страница 33: ...re 3 1 Transition From To Trigger 1 RUN LPRUN Configure settings shown in Table 3 1 switch LPR 1 last LPRUN RUN Clear LPR Interrupt when LPWUI 1 2 RUN STOP2 Pre configure settings shown in Table 3 1 i...

Страница 34: ...Wait LPRun CPU Off Standby Standby On RAM Standby Standby Standby On Flash Off Standby Standby On Port I O Registers Off Standby Standby On ADC Off Optionally On1 1 Requires the asynchronous ADC clock...

Страница 35: ...espectively 5 IRCLKEN and IREFSTEN set in ICSC1 else in standby 6 ICS must be configured for FBELP bus frequency limited to 125 kHz in LPRUN or LPWAIT 7 If LVDSE is set when entering stop2 the MCU wil...

Страница 36: ...Chapter 3 Modes of Operation MC9S08QL8 MCU Series Reference Manual Rev 1 36 NXP Semiconductors...

Страница 37: ...Interrupt Vector Assignments Table 4 1 shows address assignments for reset and interrupt vectors The vector names shown in this table are the labels used in the NXP Semiconductors provided equate fil...

Страница 38: ...rsion Vadc 0xFFDA 0xFFDB KBI Interrupt Vkeyboard 0xFFDC 0xFFDD Reserved 0xFFDE 0xFFDF SCI Transmit Vscitx 0xFFE0 0xFFE1 SCI Receive Vscirx 0xFFE2 0xFFE3 SCI Error Vscierr 0xFFE4 0xFFE5 Reserved 0xFFE6...

Страница 39: ...ations are flash memory they must be erased and programmed like other flash memory locations Direct page registers can be accessed with efficient direct addressing mode instructions Bit manipulation i...

Страница 40: ...0 ADCSC1 COCO AIEN ADCO ADCH 0x0011 ADCSC2 ADACT ADTRG ACFE ACFGT 0 0 R R 0x0012 ADCRH 0 0 0 0 ADR11 ADR10 ADR9 ADR8 0x0013 ADCRL ADR7 ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0 0x0014 ADCCVH 0 0 0 0 ADCV11 A...

Страница 41: ...7 6 5 4 3 2 1 Bit 0 0x0045 TPMC0SC CH0F CH0IE MS0B MS0A ELS0B ELS0A 0 0 0x0046 TPMC0VH Bit 15 14 13 12 11 10 9 Bit 8 0x0047 TPMC0VL Bit 7 6 5 4 3 2 1 Bit 0 0x0048 0x005F Reserved Table 4 3 High Page...

Страница 42: ...the factory trim 0x1810 0x181F Reserved 0x1820 FCDIV DIVLD PRDIV8 DIV 0x1821 FOPT KEYEN FNORED 0 0 0 0 SEC01 SEC00 0x1822 Reserved 0x1823 FCNFG 0 0 KEYACC 0 0 0 0 0 0x1824 FPROT FPS FPDIS 0x1825 FSTAT...

Страница 43: ...power on the contents of RAM are uninitialized RAM data is unaffected by any reset provided that the supply voltage does not drop below the minimum value for RAM retention VRAM For compatibility with...

Страница 44: ...le block protection Security feature for flash and RAM Auto power down for low frequency read accesses 4 5 2 Program and Erase Times Before any program or erase command can be accepted the flash clock...

Страница 45: ...h 2 Write the command code for the desired command to FCMD The five valid commands are blank check 0x05 byte program 0x20 burst program 0x25 page erase 0x40 and mass erase 0x41 The command code is lat...

Страница 46: ...When a burst program command is issued the charge pump is enabled and then remains enabled after completion of the burst program operation if these two conditions are met The next burst program comman...

Страница 47: ...he standard time instead of the burst time This is because the high voltage to the array must be disabled and then enabled again If a new burst command has not been queued before the current command c...

Страница 48: ...ound debug command while the MCU is secured The background debug controller can only do blank check and mass erase commands when the MCU is secure Writing 0 to FCBEF to cancel a partial command 4 5 6...

Страница 49: ...ors 0xFFC0 0xFFFD are redirected to the locations 0xFDC0 0xFDFD For instance if a TPM overflow interrupt is taken the values in the locations 0xFDF0 FDF1 are used for the vector instead of the values...

Страница 50: ...ches the key stored in the flash locations SEC01 SEC00 are automatically changed to 1 0 and security will be disengaged until the next reset The security key can be written only from secure memory eit...

Страница 51: ...ield Descriptions Field Description 7 DIVLD Divisor Loaded Status Flag When set this read only status flag indicates that the FCDIV register has been written since reset Reset clears this bit and the...

Страница 52: ...this bit is 0 the backdoor key mechanism cannot be used to disengage security The backdoor key mechanism is accessible only from user secured firmware BDM commands cannot be used to write key compari...

Страница 53: ...entry or a successful blank check of flash SEC01 SEC00 Description 0 0 secure 0 1 secure 1 0 unsecured 1 1 secure 7 6 5 4 3 2 1 0 R 0 0 KEYACC 0 0 0 0 0 W Reset 0 0 0 0 0 0 0 0 Unimplemented or Reser...

Страница 54: ...cates that the command buffer is empty so that a new command sequence can be executed when performing burst programming The FCBEF bit is cleared by writing a 1 to it or when a burst program command is...

Страница 55: ...ered access errors see Section 4 5 5 Access Errors FACCERR is cleared by writing a 1 to FACCERR Writing a 0 to FACCERR has no meaning or effect 0 No access error 1 An access error has occurred 2 FBLAN...

Страница 56: ...Chapter 4 Memory MC9S08QL8 MCU Series Reference Manual Rev 1 56 NXP Semiconductors...

Страница 57: ...rrupt vector for most modules reduces polling overhead see Table 5 2 5 3 MCU Reset Resetting the MCU provides a way to start processing from a known set of initial conditions During reset most control...

Страница 58: ...er the bus clock or an internal 1 kHz clock source With each clock source there is an associated short and long time out controlled by COPT in SOPT1 Table 5 1 summaries the control functions of the CO...

Страница 59: ...CPU registers on the stack Setting the I bit in the CCR to mask further interrupts Fetching the interrupt vector for the highest priority interrupt that is currently pending Filling the instruction qu...

Страница 60: ...before returning from the ISR Typically the flag is cleared at the beginning of the ISR so that if another interrupt is generated by this same source it will be registered so it can be serviced after...

Страница 61: ...ls In the edge and level detection mode the IRQF status flag becomes set when an edge is detected when the IRQ pin changes from the deasserted to the asserted level but the flag is continuously set an...

Страница 62: ...SCI TDRE TC TIE TCIE SCI transmit 15 0xFFE0 0xFFE1 Vscirx SCI IDLE RDRF LBKDIF RXEDGIF ILIE RIE LBKDIE RXEDGIE SCI receive 14 0xFFE2 0xFFE3 Vscierr SCI OR NF FE PF ORIE NFIE FEIE PFIE SCI error 13 0xF...

Страница 63: ...risen above the low voltage detection threshold The LVD bit in the SRS register is set following either an LVD reset or POR 5 6 3 Low Voltage Detection LVD Interrupt Operation When a low voltage cond...

Страница 64: ...space are related to reset and interrupt systems Refer to Table 4 2 and Table 4 3 in Chapter 4 Memory for the absolute address assignments for all registers This section refers to registers and contr...

Страница 65: ...enables the IRQ pin function When this bit is set the IRQ pin can be used as an interrupt request 0 IRQ pin function is disabled 1 IRQ pin function is enabled 3 IRQF IRQ Flag This read only status bit...

Страница 66: ...s ramping up at the time the low voltage reset LVD status bit is also set to indicate that the reset occurred while the internal supply was below the LVD threshold 0 Reset not caused by POR 1 POR caus...

Страница 67: ...Reserved 1 BDFR is writable only through serial background debug commands not from user programs Figure 5 4 System Background Debug Force Reset Register SBDFR Table 5 5 SBDFR Register Field Descriptio...

Страница 68: ...rite once bit is used to enable stop mode If stop mode is disabled and a user program attempts to execute a STOP instruction an illegal opcode reset is forced 0 Stop mode disabled 1 Stop mode enabled...

Страница 69: ...e 5 7 SOPT2 Register Field Descriptions Field Description 7 COPCLKS COP Watchdog Clock Select This write once bit selects the clock source of the COP watchdog 0 Internal 1 kHz clock is source to COP 1...

Страница 70: ...5 8 SDIDH Register Field Descriptions Field Description 7 4 Reserved Bits 7 4 are reserved Reading these bits will result in an indeterminate value writes have no effect 3 0 ID 11 8 Part Identificati...

Страница 71: ...VDACK Low Voltage Detect Acknowledge This write only bit is used to acknowledge low voltage detection errors write 1 to clear LVDF Reads always return 0 5 LVDIE Low Voltage Detect Interrupt Enable Thi...

Страница 72: ...terrupt occurs 0 Low power run and wait modes are disabled 1 Low power run and wait modes are enabled 6 LPRS Low Power Regulator Status This read only status bit indicates that the voltage regulator h...

Страница 73: ...Management Status and Control 3 Register SPMSC3 Table 5 12 SPMSC3 Register Field Descriptions Field Description 7 LVWF Low Voltage Warning Flag The LVWF bit indicates the low voltage warning status 0...

Страница 74: ...6 5 4 3 2 1 0 R MTIM 1 TPM ADC 1 1 1 SCI W Reset 1 1 1 1 1 1 1 1 Figure 5 12 System Clock Gating Control 1 Register SCGC1 Table 5 14 SCGC1 Register Field Descriptions Field Description 7 MTIM MTIM Clo...

Страница 75: ...able 5 15 SCGC2 Register Field Descriptions Field Description 6 FLS Flash Register Clock Gate Control This bit controls the bus clock gate to the Flash module 0 Bus clock to the Flash module is disabl...

Страница 76: ...Chapter 5 Resets Interrupts and General System Control MC9S08QL8 MCU Series Reference Manual Rev 1 76 NXP Semiconductors...

Страница 77: ...pplication program must either enable on chip pullup devices or change the direction of unconnected pins to outputs so the pins do not float 6 1 Port Data and Data Direction Reading and writing of par...

Страница 78: ...ach port pin by setting the corresponding bit in the pullup enable register PTxPEn The pullup device is disabled if the pin is configured as an output by the parallel I O control logic or any shared p...

Страница 79: ...O the user must examine the state of the PPDF bit in the SPMSC2 register If the PPDF bit is 0 I O must be initialized as if a power on reset had occurred If the PPDF bit is 1 I O register states must...

Страница 80: ...n bit PTADD4 Figure 6 2 Port A Data Register PTAD Table 6 1 PTAD Register Field Descriptions Field Description 5 0 PTAD 5 0 Port A Data Register Bits For port A pins that are inputs reads return the l...

Страница 81: ...or port A pins that are configured as outputs these bits have no effect and the internal pull devices are disabled 0 Internal pullup pulldown device disabled for port A bit n 1 Internal pullup pulldow...

Страница 82: ...W Reset 0 0 0 0 0 0 0 0 Figure 6 6 Drive Strength Selection for Port A Register PTADS Table 6 5 PTADS Register Field Descriptions Field Description 4 0 PTADS 4 0 Output Drive Strength Selection for P...

Страница 83: ...o all bits of this register For port B pins that are configured as outputs the logic level is driven out the corresponding MCU pin Reset forces PTBD to all 0s but these 0s are not driven out the corre...

Страница 84: ...port B pins that are configured as outputs these bits have no effect and the internal pull devices are disabled 0 Internal pullup pulldown device disabled for port B bit n 1 Internal pullup pulldown...

Страница 85: ...igure 6 11 Drive Strength Selection for Port B Register PTBDS Table 6 10 PTBDS Register Field Descriptions Field Description 7 0 PTBDS 7 0 Output Drive Strength Selection for Port B Bits Each of these...

Страница 86: ...s outputs the logic level is driven out of the corresponding MCU pin Reset forces PTCD to all 0s but these 0s are not driven out of the corresponding pins because reset also configures all port pins a...

Страница 87: ...For port C pins that are configured as outputs these bits have no effect and the internal pull devices are disabled 0 Internal pullup device disabled for port C bit n 1 Internal pullup device enabled...

Страница 88: ...Strength Selection for Port C Register PTCDS Table 6 15 PTCDS Register Field Descriptions Field Description 3 0 PTCDS 3 0 Output Drive Strength Selection for Port C Bits Each of these control bits se...

Страница 89: ...ght independently enabled external interrupt sources 7 1 1 KBI Clock Gating The bus clock to the KBI can be gated on and off using the KBI bit in SCGC2 This bit is set after any reset which enables th...

Страница 90: ...I continues to operate in wait mode if enabled before executing the WAIT instruction Therefore an enabled KBI pin KBPEx 1 can be used to bring the MCU out of wait mode if the KBI interrupt is enabled...

Страница 91: ...ng edge and low level interrupt requests The KBI input pins can also be used to detect either rising edges or both rising edge and high level interrupt requests Table 7 1 KBI Pin Mapping Port pin PTB3...

Страница 92: ...KBIE KBIMOD W KBACK Reset 0 0 0 0 0 0 0 0 Figure 7 2 KBI Interrupt Status and Control Register KBISC Table 7 2 KBISC Register Field Descriptions Field Description 3 KBF KBI Interrupt Flag KBF indicate...

Страница 93: ...e sensitivity can be software programmed to be either falling or rising the level can be either low or high The polarity of the 7 6 5 4 3 2 1 0 R KBIPE7 KBIPE6 KBIPE5 KBIPE4 KBIPE3 KBIPE2 KBIPE1 KBIPE...

Страница 94: ...et an interrupt request will be presented to the CPU Clearing of KBF is accomplished by writing a 1 to KBACK in KBISC provided all enabled port inputs are at their deasserted levels KBF will remain se...

Страница 95: ...ingle 64 Kbyte address space 16 bit stack pointer any size stack anywhere in 64 KB CPU address space 16 bit index register H X with powerful indexed addressing modes 8 bit accumulator A Many instructi...

Страница 96: ...8 bit registers H and X which often work together as a 16 bit address pointer where H holds the upper byte of an address and X holds the lower byte of the address All indexed addressing mode instructi...

Страница 97: ...bility with the M68HC05 Family and is seldom used in new HCS08 programs because it only affects the low order half of the stack pointer 8 2 4 Program Counter PC The program counter is a 16 bit registe...

Страница 98: ...n of the interrupt service routine is executed Interrupts are not recognized at the instruction boundary after any instruction that clears I CLI or TAP This ensures that the next instruction after a C...

Страница 99: ...if any are located within CPU registers so the CPU does not need to access memory to get any operands 8 3 2 Relative Addressing Mode REL Relative addressing mode is used to specify the destination lo...

Страница 100: ...is only used for MOV and CBEQ instructions 8 3 6 3 Indexed 8 Bit Offset IX1 This variation of indexed addressing uses the 16 bit value in the H X index register pair plus an unsigned 8 bit offset incl...

Страница 101: ...n is no longer asserted At the conclusion of a reset event the CPU performs a 6 cycle sequence to fetch the reset vector from 0xFFFE and 0xFFFF and to fill the instruction queue in preparation for exe...

Страница 102: ...o the MCU through the background debug interface while the CPU is in wait mode CPU clocks will resume and the CPU will enter active background mode where other serial background commands can be proces...

Страница 103: ...ng user instructions and enter the active background mode The only way to resume execution of the user program is through reset or by a host debug system issuing a GO TRACE1 or TAGGO serial command th...

Страница 104: ...X Index register lower order least significant 8 bits PC Program counter PCH Program counter higher order most significant 8 bits PCL Program counter lower order least significant 8 bits SP Stack poi...

Страница 105: ...es to a single integer in the range 0 7 opr8i Any label or expression that evaluates to an 8 bit immediate value opr16i Any label or expression that evaluates to a 16 bit immediate value opr8a Any lab...

Страница 106: ...2 3 4 4 3 3 5 4 ADD opr8i ADD opr8a ADD opr16a ADD oprx16 X ADD oprx8 X ADD X ADD oprx16 SP ADD oprx8 SP Add without Carry A A M IMM DIR EXT IX2 IX1 IX SP2 SP1 AB BB CB DB EB FB 9EDB 9EEB ii dd hh ll...

Страница 107: ...Branch if IRQ Pin High Branch if IRQ pin 1 REL 2F rr 3 BIL rel Branch if IRQ Pin Low Branch if IRQ pin 0 REL 2E rr 3 BIT opr8i BIT opr8a BIT opr16a BIT oprx16 X BIT oprx8 X BIT X BIT oprx16 SP BIT op...

Страница 108: ...M Branch if A M Branch if A M DIR IMM IMM IX1 IX SP1 31 41 51 61 71 9E61 dd rr ii rr ii rr ff rr rr ff rr 5 4 4 5 5 6 CLC Clear Carry Bit C 0 0 INH 98 1 CLI Clear Interrupt Mask Bit I 0 0 INH 9A 1 CLR...

Страница 109: ...A A M 0 IMM DIR EXT IX2 IX1 IX SP2 SP1 A8 B8 C8 D8 E8 F8 9ED8 9EE8 ii dd hh ll ee ff ff ee ff ff 2 3 4 4 3 3 5 4 INC opr8a INCA INCX INC oprx8 X INC X INC oprx8 SP Increment M M 0x01 A A 0x01 X X 0x01...

Страница 110: ...0x00 X M M 0x00 M M M 0x00 M M M 0x00 M DIR INH INH IX1 IX SP1 30 40 50 60 70 9E60 dd ff ff 5 1 1 5 4 6 NOP No Operation Uses 1 Bus Cycle INH 9D 1 NSA Nibble Swap Accumulator A A 3 0 A 7 4 INH 62 1 O...

Страница 111: ...mory M A 0 DIR EXT IX2 IX1 IX SP2 SP1 B7 C7 D7 E7 F7 9ED7 9EE7 dd hh ll ee ff ff ee ff ff 3 4 4 3 2 5 4 STHX opr8a STHX opr16a STHX oprx8 SP Store H X Index Reg M M 0x0001 H X 0 DIR EXT SP1 35 96 9EFF...

Страница 112: ...A 0x00 X 0x00 M 0x00 M 0x00 M 0x00 0 DIR INH INH IX1 IX SP1 3D 4D 5D 6D 7D 9E6D dd ff ff 4 1 1 4 3 5 TSX Transfer SP to Index Reg H X SP 0x0001 INH 95 2 TXA Transfer X Index Reg Low to Accumulator A...

Страница 113: ...8 5 BRSET4 3 DIR 18 5 BSET4 2 DIR 28 3 BHCC 2 REL 38 5 LSL 2 DIR 48 1 LSLA 1 INH 58 1 LSLX 1 INH 68 5 LSL 2 IX1 78 4 LSL 1 IX 88 3 PULX 1 INH 98 1 CLC 1 INH A8 2 EOR 2 IMM B8 3 EOR 2 DIR C8 4 EOR 3 EX...

Страница 114: ...E6A 6 DEC 3 SP1 9EDA 5 ORA 4 SP2 9EEA 4 ORA 3 SP1 9E6B 8 DBNZ 4 SP1 9EDB 5 ADD 4 SP2 9EEB 4 ADD 3 SP1 9E6C 6 INC 3 SP1 9E6D 5 TST 3 SP1 9EAE 5 LDHX 2 IX 9EBE 6 LDHX 4 IX2 9ECE 5 LDHX 3 IX1 9EDE 5 LDX...

Страница 115: ...Control 1 Register SPMSC1 for value of bandgap voltage reference see the data sheet BKGDPE bit in SOPT1 register is set following any reset of the MCU and must be cleared to use the PTA4 ACMPO BKGD MS...

Страница 116: ...e in stop3 mode and compare operation remains active If ACOPE is enabled comparator output operates in the normal operating mode and comparator output is placed onto the external pin The MCU is brough...

Страница 117: ...CU documentation to determine what functions are shared with these analog inputs As shown in the block diagram the ACMP pin is connected to the comparator non inverting input if ACBGS is equal to logi...

Страница 118: ...Comparator enabled 6 ACBGS Analog Comparator Bandgap Select The ACBGS bit selects the internal bandgap as the comparator reference 0 External pin ACMP selected as comparator non inverting input 1 Int...

Страница 119: ...parator S08ACMPVLPV1 MC9S08QL8 MCU Series Reference Manual Rev 1 NXP Semiconductors 119 ACIE bit or the ACF bit The ACIE bit is cleared by writing a logic zero and the ACF bit is cleared by writing a...

Страница 120: ...Analog Comparator S08ACMPVLPV1 MC9S08QL8 MCU Series Reference Manual Rev 1 120 NXP Semiconductors...

Страница 121: ...g Supply and Voltage Reference Connections The MC9S08QL8 series VDDA VREFH and VSSA VREFL pins are double bonded to VDD and VSS in the 20 pin and 16 pin packages 10 1 2 2 Configurations for Stop and L...

Страница 122: ...o trigger the ADC The RTC can be clocked by either ICSIRCLK OSCOUT or LPO The period of the RTC is determined by the input clock frequency and the RTC configuration bits When the ADC hardware trigger...

Страница 123: ...of the temperature sensor Temp 25 VTEMP VTEMP25 m Eqn 10 1 where VTEMP is the voltage of the temperature sensor channel at the ambient temperature VTEMP25 is the voltage of the temperature sensor cha...

Страница 124: ...omatic return to idle after single conversion Configurable sample time and conversion speed power Conversion complete flag and interrupt Input clock selectable from up to four sources Operation in wai...

Страница 125: ...tion AD27 AD0 Analog Channel inputs VREFH High reference voltage VREFL Low reference voltage VDDA Analog power supply VSSA Analog ground AD0 AD27 VREFH VREFL ADVIN ADCH Control Sequencer initialize sa...

Страница 126: ...xternal source between the minimum VDDA spec and the VDDA potential VREFH must never exceed VDDA 10 2 4 Voltage Reference Low VREFL VREFL is the low reference voltage for the converter In some package...

Страница 127: ...CSC1 when software triggered operation is selected or one conversion following assertion of ADHWT when hardware triggered operation is selected 1 Continuous conversions initiated following a write to...

Страница 128: ...lect Selects the type of trigger used for initiating a conversion Two types of triggers are selectable software trigger and hardware trigger When software trigger is selected a conversion is initiated...

Страница 129: ...lost In 8 bit mode there is no interlocking with ADCRL If the MODE bits are changed any data in ADCRH becomes invalid 10 3 4 Data Result Low Register ADCRL ADCRL contains the lower eight bits of a 12...

Страница 130: ...pare 10 3 6 Compare Value Low Register ADCCVL This register holds the lower eight bits of the 12 bit or 10 bit compare value or all eight bits of the 8 bit compare value When the compare function is e...

Страница 131: ...selects between long and short sample time This adjusts the sample period to allow higher impedance inputs to be accurately sampled or to maximize conversion speed for lower impedance inputs Longer sa...

Страница 132: ...Field Description 7 ADPC7 ADC Pin Control 7 ADPC7 controls the pin associated with channel AD7 0 AD7 pin I O control enabled 1 AD7 pin I O control disabled 6 ADPC6 ADC Pin Control 6 ADPC6 controls the...

Страница 133: ...controls the pin associated with channel AD15 0 AD15 pin I O control enabled 1 AD15 pin I O control disabled 6 ADPC14 ADC Pin Control 14 ADPC14 controls the pin associated with channel AD14 0 AD14 pi...

Страница 134: ...23 controls the pin associated with channel AD23 0 AD23 pin I O control enabled 1 AD23 pin I O control disabled 6 ADPC22 ADC Pin Control 22 ADPC22 controls the pin associated with channel AD22 0 AD22...

Страница 135: ...perates with any of the conversion modes and configurations 10 4 1 Clock Select and Divide Control One of four clock sources can be selected as the clock source for the ADC module This clock source is...

Страница 136: ...dge occurs the rising edge is ignored In continuous convert configuration only the initial rising edge to launch continuous conversions is observed The hardware trigger function operates in conjunctio...

Страница 137: ...rsion in progress is aborted when A write to ADCSC1 occurs the current conversion will be aborted and a new conversion will be initiated if ADCH are not all 1s A write to ADCSC2 ADCCFG ADCCVH or ADCCV...

Страница 138: ...ersion time for a single conversion is NOTE The ADCK frequency must be between fADCK minimum and fADCK maximum to meet ADC specifications Table 10 13 Total Conversion Time vs Control Conditions Conver...

Страница 139: ...peration Upon completion of a conversion while the compare function is enabled if the compare condition is not true COCO is not set and no data is transferred to the result registers NOTE The compare...

Страница 140: ...e value of Result Compare Value 10 4 6 MCU Wait Mode Operation Wait mode is a lower power consumption standby mode from which recovery is fast because the clock sources remain active If a conversion i...

Страница 141: ...cleared when entering stop3 and continuing ADC conversions 10 4 8 MCU Stop2 Mode Operation The ADC module is automatically disabled when the MCU enters stop2 mode All module registers contain their r...

Страница 142: ...4 ADLSMP 1 Configures for long sample time Bit 3 2 MODE 10 Sets mode at 10 bit conversions Bit 1 0 ADICLK 00 Selects bus clock as input clock source ADCSC2 0x00 00000000 Bit 7 ADACT 0 Flag indicates...

Страница 143: ...associated with the ADC module and how they should be used for best results 10 6 1 1 Analog Supply Pins The ADC module has analog power and ground supplies VDDA and VSSA available as separate pins on...

Страница 144: ...tor is connected between VREFH and VREFL and must be placed as near as possible to the package pins Resistance in the path is not recommended because the current causes a voltage drop that could resul...

Страница 145: ...Leakage on the I O pins can cause conversion error if the external analog source resistance RAS is high If this error cannot be tolerated by the application keep RAS lower than VDDA 2N ILEAK for less...

Страница 146: ...the result For 8 bit or 10 bit conversions the code transitions when the voltage is at the midpoint between the points where the straight line transfer function is exactly represented by the actual t...

Страница 147: ...ter is when at certain points a given input voltage converts to one of two values when sampled repeatedly Ideally when the input voltage is infinitesimally smaller than the transition voltage the conv...

Страница 148: ...Analog to Digital Converter S08ADC12V1 MC9S08QL8 MCU Series Reference Manual Rev 1 148 NXP Semiconductors...

Страница 149: ...is FLL clock or either of the internal or external reference clocks as a source for the MCU system clock There are also signals provided to control a low power oscillator XOSCVLP module to allow the u...

Страница 150: ...ichever clock is selected as the source can be divided down 2 bit select for clock divider is provided Allowable dividers are 1 2 4 8 Control signals for a low power oscillator clock generator OSCOUT...

Страница 151: ...aged external mode the ICS supplies a clock derived from the FLL which is controlled by an external reference clock source The BDC clock is supplied from the FLL 11 1 4 3 FLL Bypassed Internal FBI In...

Страница 152: ...and the ICS supplies a clock derived from the external reference clock The BDC clock is not available 11 1 4 7 Stop STOP In stop mode the FLL is disabled and the internal or the ICS external reference...

Страница 153: ...vide down the external reference clock Resulting frequency must be in the range 31 25 kHz to 39 0625 kHz See Table 11 3 for the divide by factors 2 IREFS Internal Reference Select The IREFS bit select...

Страница 154: ...the external oscillator 4 HGO High Gain Oscillator Select The HGO bit controls the external oscillator mode of operation 1 Configure external oscillator for high gain operation 0 Configure external os...

Страница 155: ...ng reset from a factory programmed location when not in any BDM mode If in a BDM mode FTRIM gets loaded with a value of 1 b0 W DRS Reset 0 0 0 1 0 0 0 Figure 11 5 ICS Status and Control Register ICSSC...

Страница 156: ...If the external reference clock is selected by ERCLKEN or by the ICS being in FEE FBE or FBELP mode and if EREFS is set then this bit is set after the initialization cycles of the external oscillator...

Страница 157: ...clock is derived from the FLL clock which is controlled by the internal reference clock The FLL loop locks the frequency to the FLL factor times the internal reference frequency The ICSLCLK is availab...

Страница 158: ...LL bypassed internal mode the ICSOUT clock is derived from the internal reference clock The FLL clock is controlled by the internal reference clock and the FLL loop locks the FLL frequency to the FLL...

Страница 159: ...signals are static except in the following cases ICSIRCLK will be active in stop mode when all the following conditions occur IRCLKEN bit is written to 1 IREFSTEN bit is written to 1 OSCOUT will be ac...

Страница 160: ...used as an additional clock source To re target the ICSIRCLK frequency write a new value to the TRIM bits in the ICSTRM register to trim the period of the internal reference clock Writing a larger val...

Страница 161: ...imum frequency the chip level timing specifications support see Chapter 1 Device Overview If EREFSTEN is set and the ERCLKEN bit is written to 1 the external reference clock source OSCOUT keeps runnin...

Страница 162: ...Internal Clock Source S08ICSV3 MC9S08QL8 MCU Series Reference Manual Rev 0 162 NXP Semiconductors...

Страница 163: ...based software loops 12 1 1 MTIM TPM Configuration Information The external clock for the MTIM module TCLK is selected by setting CLKS 1 1 or 1 0 in MTIMCLK which selects the TCLK pin input The TCLK...

Страница 164: ...he MTIM can be used to bring the MCU out of wait mode if the timer overflow interrupt is enabled For lowest possible current consumption the MTIM should be stopped by software if not needed as an inte...

Страница 165: ...hronized by the bus clock Also variations in duty cycle and clock jitter must be accommodated Therefore the TCLK signal must be limited to one fourth of the bus frequency The TCLK pin can be muxed wit...

Страница 166: ...mary in the Memory chapter of this data sheet for the absolute address assignments for all MTIM registers This section refers to registers and control bits only by their names and relative address off...

Страница 167: ...register 0 MTIM counter has not reached the overflow value in the MTIM modulo register 1 MTIM counter has reached the overflow value in the MTIM modulo register 6 TOIE MTIM Overflow Interrupt Enable...

Страница 168: ...et clears CLKS to 000 00 Encoding 0 Bus clock BUSCLK 01 Encoding 1 Fixed frequency clock XCLK 10 Encoding 3 External source TCLK pin falling edge 11 Encoding 4 External source TCLK pin rising edge All...

Страница 169: ...ld Description 7 0 COUNT MTIM Count These eight read only bits contain the current value of the 8 bit counter Writes have no effect to this register Reset clears the count to 0x00 7 6 5 4 3 2 1 0 R MO...

Страница 170: ...cale values are software selectable clock source divided by 1 2 4 8 16 32 64 128 or 256 The prescaler select bits PS 3 0 in MTIMSC select the desired prescale value If the counter is active TSTP 0 whe...

Страница 171: ...cted clock source could be any of the five possible choices The prescaler is set to PS 0010 or divide by 4 The modulo value in the MTIMMOD register is set to 0xAA When the counter MTIMCNT reaches the...

Страница 172: ...Modulo Timer S08MTIMV1 MC9S08QL8 MCU Series Reference Manual Rev 1 172 NXP Semiconductors...

Страница 173: ...odule on MC9S08QL8 series can be clocked from the ICSIRCLK OSCOUT or the LPO ICSIRCLK is connected to the IRCLK input and OSCOUT is connected to ERCLK input ICSERCLK is not available as a source to th...

Страница 174: ...errupt is enabled For lowest possible current consumption the RTC should be stopped by software if not needed as an interrupt source during wait mode 13 1 7 2 Stop Modes The RTC continues to run in st...

Страница 175: ...er Refer to the direct page register summary in the memory section of this document for the absolute address assignments for all RTC registers This section refers to registers and control bits only by...

Страница 176: ...TC prescaler Changing the clock source clears the prescaler and RTCCNT counters When selecting a clock source ensure that the clock source is properly enabled if applicable to ensure correct operation...

Страница 177: ...LPO the external clock ERCLK and the internal clock IRCLK The RTC clock select bits RTCLKS select the desired clock source If a different value is written to RTCLKS the prescaler and RTCCNT counters a...

Страница 178: ...for an interrupt to be generated when RTIF is set To enable the real time interrupt set the real time interrupt enable bit RTIE in RTCSC RTIF is cleared by writing a 1 to RTIF 13 4 1 RTC Operation Ex...

Страница 179: ...direction to a user on how to initialize and configure the RTC module The example software is implemented in C language The example below shows how to implement time of day with the RTC using the 1 kH...

Страница 180: ...onductors pragma TRAP_PROC void RTC_ISR void Clear the interrupt flag RTCSC byte RTCSC byte 0x80 RTC interrupts every 1 Second Seconds 60 seconds in a minute if Seconds 59 Minutes Seconds 0 60 minutes...

Страница 181: ...is not available in this device 14 1 1 SCI Clock Gating The bus clock to the SCI can be gated on and off using the SCI bit in SCGC1 This bit is set after any reset which enables the bus clock to this...

Страница 182: ...E SCID Read Rx data write Tx data R5 T5 R7 T7 R6 T6 Rx Tx pin direction in Local interrupt enables R4 T4 R3 T3 R2 T2 R1 T1 R0 T0 TXINV Tx data path polarity single wire mode Module Initialization Writ...

Страница 183: ...error framing error and noise error Idle receiver detect Active edge on receive pin Break detect supporting LIN Hardware parity generation and checking Programmable 8 bit or 9 bit character length Re...

Страница 184: ...7 6 5 4 3 2 1 0 L SCID Tx BUFFER WRITE ONLY INTERNAL BUS STOP 11 BIT TRANSMIT SHIFT REGISTER START SHIFT DIRECTION LSB 1 BAUD RATE CLOCK PARITY GENERATION TRANSMIT CONTROL SHIFT ENABLE PREAMBLE ALL 1s...

Страница 185: ...BUS STOP 11 BIT RECEIVE SHIFT REGISTER START SHIFT DIRECTION LSB FROM RxD PIN RATE CLOCK Rx INTERRUPT REQUEST DATA RECOVERY DIVIDE 16 BAUD SINGLE WIRE LOOP CONTROL WAKEUP LOGIC ALL 1s MSB FROM TRANSM...

Страница 186: ...e so after reset the baud rate generator remains disabled until the first time the receiver or transmitter is enabled RE or TE bits in SCIC2 are written to 1 7 6 5 4 3 2 1 0 R LBKDIE RXEDGIE 0 SBR12 S...

Страница 187: ...SCISWAI SCI Stops in Wait Mode 0 SCI clocks continue to run in wait mode so the SCI can be the source of an interrupt that wakes up the CPU 1 SCI clocks freeze while CPU is in wait mode 5 RSRC Receive...

Страница 188: ...TDRE flag is 1 6 TCIE Transmission Complete Interrupt Enable for TC 0 Hardware interrupts from TC disabled use polling 1 Hardware interrupt requested when TC flag is 1 5 RIE Receiver Interrupt Enable...

Страница 189: ...ificant data bit in a character WAKE 1 address mark wakeup Application software sets RWU and normally a selected hardware condition automatically clears RWU Refer to Section 14 3 3 2 Receiver Wakeup O...

Страница 190: ...r is all 1s these bit times and the stop bit time count toward the full character time of logic high 10 or 11 bit times depending on the M control bit needed for the receiver to detect an idle line Wh...

Страница 191: ...circuitry is enabled and a LIN break character is detected LBKDIF is cleared by writing a 1 to it 0 No LIN break character has been detected 1 LIN break character has been detected 6 RXEDGIF RxD Pin A...

Страница 192: ...waiting for a start bit 1 SCI receiver active RxD input not idle 1 Setting RXINV inverts the RxD input for all cases data bits start and stop bits break and idle 7 6 5 4 3 2 1 0 R R8 T8 TXDIR TXINV OR...

Страница 193: ...rate clock 4 TXINV1 Transmit Data Inversion Setting this bit reverses the polarity of the transmitted data output 0 Transmit data not inverted 1 Transmit data inverted 3 ORIE Overrun Interrupt Enable...

Страница 194: ...2 The transmitter output TxD idle state defaults to logic high TXINV 0 following reset The transmitter output is inverted by setting TXINV 1 The transmitter is enabled by setting the TE bit in SCIC2...

Страница 195: ...en write 1 to the TE bit This action queues an idle character to be sent as soon as the shifter is available As long as the character in the shifter does not finish while TE 0 the SCI transmitter neve...

Страница 196: ...case of the start bit the bit is assumed to be 0 if at least two of the samples at RT3 RT5 and RT7 are 0 even if one or all of the samples taken at RT8 RT9 and RT10 are 1s If any sample in any bit ti...

Страница 197: ...tically when the receiver detects a logic 1 in the most significant bit of a received character eighth bit in M 0 mode and ninth bit in M 1 mode Address mark wakeup allows messages to contain idle cha...

Страница 198: ...lready set when a new character is ready to be transferred from the receive shifter to the receive data buffer the overrun OR flag gets set instead the data along with any associated NF FE or PF condi...

Страница 199: ...ometimes used to check software independent of connections in the external system to help isolate system problems In this mode the transmitter output is internally connected to the receiver input and...

Страница 200: ...Serial Communications Interface S08SCIV4 MC9S08QL8 MCU Series Reference Manual Rev 1 200 NXP Semiconductors...

Страница 201: ...n be repositioned under software control using TPMCH0PS bits in SOPT2 as shown in Table 15 1 15 1 4 TPM Clock Gating The bus clock to the TPM can be gated on and off using the TPM bit in SCGC1 This bi...

Страница 202: ...ars this read coherency mechanism Does not clear this read coherency mechanism Read of TPMxCnVH L registers2 In BDM mode any read of TPMxCnVH L registers Returns the value of the TPMxCnVH L register I...

Страница 203: ...TPMxMODH L 1 6 Produces a near 100 duty cycle Produces 0 duty cycle TPMxCnVH L is changed from 0x0000 to a non zero value7 Waits for the start of a new PWM period to begin using the new duty cycle set...

Страница 204: ...0xFFFF Also when configuring the TPM modules it is best to write to TPMxSC before TPMxCnV as a write to TPMxSC resets the coherency mechanism on the TPMxCnV registers 8 For more information refer to S...

Страница 205: ...TPM all channels to switch to center aligned PWM mode When center aligned PWM mode is selected input capture output compare and edge aligned PWM functions are not available on any channels of this TPM...

Страница 206: ...signal is called center aligned because the centers of the active duty cycle periods for all channels are aligned with a count value of zero This type of PWM is required for types of motors used in s...

Страница 207: ...S MS0B MS0A counter reset CLKSB CLKSA 1 2 4 8 16 32 64 or 128 bus clock external clock synchronizer 16 bit comparator 16 bit latch channel 1 ELS1B ELS1A CH1IE CH1F TPM counter Port logic Interrupt log...

Страница 208: ...e mode therefore allowing its use as a timer ELSnB ELSnA 0 0 For proper TPM operation the external clock frequency must not exceed one fourth of the bus clock frequency 15 2 1 2 TPMxCHn TPM Channel n...

Страница 209: ...ut signal When ELSnB is set and ELSnA is cleared the TPMxCHn pin is forced high at the start of each new period TPMxCNT 0x0000 and it is forced low when the channel value register matches the TPM coun...

Страница 210: ...gister matches the TPM counter and it is cleared when the TPM counter is counting down and the channel value register matches the TPM counter Figure 15 4 High true pulse of a center aligned PWM Figure...

Страница 211: ...6 TOIE Timer overflow interrupt enable This read write bit enables TPM overflow interrupts If TOIE is set an interrupt is generated when TOF equals one Reset clears TOIE 0 TOF interrupts inhibited use...

Страница 212: ...ions The coherency mechanism is automatically restarted by an MCU reset or any write to the timer status control register TPMxSC Reset clears the TPM counter registers Writing any value to TPMxCNTH or...

Страница 213: ...to 0x0000 that results in a free running timer counter modulo disabled Writes to any of the registers TPMxMODH and TPMxMODL actually writes to buffer registers and the registers are updated with the v...

Страница 214: ...e TPM channel n value registers When channel n is an edge aligned center aligned PWM channel and the duty cycle is set to 0 or 100 CHnF is not set even when the value in the TPM counter registers matc...

Страница 215: ...that is driven in response to an output compare match or select the polarity of the PWM output If ELSnB and ELSnA bits are cleared the channel pin is not controlled by TPM This configuration can be u...

Страница 216: ...econd byte is written If CLKSB and CLKSA are not cleared and in output compare mode the registers are updated after the second byte is written and on the next change of the TPM counter end of the pres...

Страница 217: ...Counter Clock Source The 2 bit field CLKSB CLKSA in the timer status and control register TPMxSC disables the TPM counter or selects one of three clock sources to TPM counter Table 15 6 After any MCU...

Страница 218: ...unter operates in up down counting mode Otherwise the counter operates as a simple up counter As an up counter the timer counter counts from 0x0000 through its terminal count and continues with 0x0000...

Страница 219: ...and according to the value of CLKSB CLKSA bits If CLKSB and CLKSA are cleared the registers are updated when the second byte is written If CLKSB and CLKSA are not cleared the registers are updated at...

Страница 220: ...wn counting mode of the timer counter CPWMS 1 The channel match value in TPMxCnVH TPMxCnVL determines the pulse width duty cycle of the PWM signal while the period is determined by the value in TPMxMO...

Страница 221: ...t all active channels within a TPM must be used in CPWM mode when CPWMS is set The timer channel registers are buffered to ensure coherent 16 bit updates and to avoid unexpected PWM pulse widths Write...

Страница 222: ...scription of Interrupt Operation For each interrupt source in the TPM a flag bit is set upon recognition of the interrupt condition such as timer overflow channel input capture or output compare event...

Страница 223: ...annel is configured as an input capture channel the ELSnB ELSnA bits select if channel pin is not controlled by TPM rising edges falling edges or any edge as the edge that triggers an input capture ev...

Страница 224: ...Timer Pulse Width Modulator S08TPMV3 MC9S08QL8 MCU Series Reference Manual Rev 1 224 NXP Semiconductors...

Страница 225: ...into the target MCU via the single wire background debug interface 16 1 1 Forcing Active Background The method for forcing active background mode depends on the specific HCS08 derivative For the MC9S0...

Страница 226: ...ow the CPU registers to be read or written and allow the user to trace one user instruction at a time or GO to the user program from active background mode Non intrusive commands can be executed at an...

Страница 227: ...ed BKGD is a pseudo open drain pin and there is an on chip pullup so no external pullup resistor is required Unlike typical open drain pins the external RC time constant on this pin which is influence...

Страница 228: ...ives the beginning of the bit time Ten target BDC clock cycles later the target senses the bit level on the BKGD pin Typically the host actively drives the pseudo open drain BKGD pin during host to ta...

Страница 229: ...time as perceived by the target MCU The host initiates the bit time but the target HCS08 finishes it Because the target wants the host to receive a logic 0 it drives the BKGD pin low for 13 BDC clock...

Страница 230: ...ve background mode while non intrusive commands may be issued at any time whether the target MCU is in active background mode or running a user application program Table 16 1 shows all HCS08 BDC comma...

Страница 231: ...ad data in the target to host direction WD 8 bits of write data in the host to target direction RD16 16 bits of read data in the target to host direction WD16 16 bits of write data in the host to targ...

Страница 232: ...E2 RBKP Read BDCBKPT breakpoint register WRITE_BKPT Non intrusive C2 WBKP Write BDCBKPT breakpoint register GO Active BDM 08 d Go to execute the user application program starting at the address curre...

Страница 233: ...munications Typically the host can determine the correct communication speed within a few percent of the actual target speed and the communication protocol can easily tolerate speed errors of several...

Страница 234: ...registers are accessed with dedicated serial BDC commands and are not located in the memory space of the target MCU so they do not have addresses and cannot be accessed by user programs Some of the b...

Страница 235: ...e commands 6 BDMACT Background Mode Active Status This is a read only status bit 0 BDM not active user application program running 1 BDM active and waiting for serial commands 5 BKPTEN BDC Breakpoint...

Страница 236: ...and into active background mode where all BDC commands work Whenever the host forces the target MCU into active background mode the host should issue a READ_STATUS command to check that BDMACT 1 befo...

Страница 237: ...ugh serial background mode debug commands not from user programs Reset 0 0 0 0 0 0 0 0 Unimplemented or Reserved Table 16 3 SBDFR Register Field Description Field Description 0 BDFR Background Debug F...

Страница 238: ...Development Support MC9S08QL8 MCU Series Reference Manual Rev 1 238 NXP Semiconductors...

Страница 239: ......

Страница 240: ...ustomer s applications and products and NXP accepts no liability for any vulnerability that is discovered Customers should implement appropriate design and operating safeguards to minimize the risks a...

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